/* -------------------------------------- */
/* Please provide your values             */
/* -------------------------------------- */
// API Key and Secret are on https://app.passkit.com/ > Developer Tools (top right menu) > REST Credentials.
var PK_API_KEY = 'your_api_key';
var PK_API_SECRET = 'your_api_secret';

function myFunction() {
  // Generate PassKit auth token for an API call
  var token = generateJWT(PK_API_KEY,PK_API_SECRET);
  var pk_url = 'https://api.pub1.passkit.io/';
  var options = {
    headers: {Authorization: token, ContentType: 'application/json'}
  }
  
  // Call PassKit API. Documentation available on https://docs.passkit.io/.
  // This example makes a get request to obtain an account profile.
  var endpoint = pk_url + 'user/profile';
  var response = UrlFetchApp.fetch(endpoint, options);
  var respText = response.getContentText();
  
  console.log(respText);
}

// Generate PassKit API token with your API key and secret
function generateJWT(key, secret) {		
    var body = {
        "uid": key,
        "exp": Math.floor(new Date().getTime() / 1000) + 3600,
        "iat": Math.floor(new Date().getTime() / 1000),
        "web": true,
    };
    header = {
        "alg": "HS256",
        "typ": "JWT"
    };
    var token = [];
    token[0] = base64url(JSON.stringify(header));
    token[1] = base64url(JSON.stringify(body));
    token[2] = genTokenSign(token, secret);
   return token.join(".");
}
function genTokenSign(token, secret) {
    if (token.length != 2) {
        return;
    }
    var hash = Utilities.computeHmacSha256Signature(token.join("."), secret);
    var base64Hash = Utilities.base64Encode(hash);
    return urlConvertBase64(base64Hash);
}
function base64url(input) {
    var base64String = Utilities.base64Encode(input);
    return urlConvertBase64(base64String);
}
function urlConvertBase64(input) {
    var output = input.replace(/=+$/, '');
    output = output.replace(/\+/g, '-');
    output = output.replace(/\//g, '_');
   return output;
}